Thermal decomposition of jarosites of potassium, sodium and lead
Jarosites are a group of minerals formed in evaporite deposits and form a component of efflorescence. As such the minerals can function as cation and heavy metal collectors. Thermogravimetry coupled to mass spectrometry has been used to study three Australian jarosites which are predominantly K, Na and Pb jarosites. Mass loss steps of K jarosite occur over the 130 to 330 and 500 to 622 degrees Celsius temperature range and are attributed to dehydroxylation and desulphation. In contrast the behaviour of the thermal decomposition of Na-jarosite shows three mass loss steps at 215 to 230, 316 to 352 and 555 to 595 degrees Celsius. The first mass loss step for Na-jarosite is attributed to deprotonation. For Pb-jarosite two mass loss steps associated with dehydroxylation are observed at 390 and 418 degrees Celsius and a third mass loss step at 531 degrees Celsius is attributed to the loss of SO3. Thermal analysis is an excellent technique for the study of jarosites. The analysis depends heavily on the actual composition of the jarosite.
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|Item Type:||Journal Article|
|Additional Information:||This paper is one of a series of papers on jarosites and alunites. Such minerals have been identified on Mars.|
|Keywords:||jarosite, dehydration, dehydroxylation, Raman spectroscopy, high, resolution thermogravimetric analysis|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2005 Springer|
|Copyright Statement:||The original publication is available at SpringerLink|
|Deposited On:||05 Oct 2005|
|Last Modified:||29 Feb 2012 13:15|
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